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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Contract | Sep. 30, 2019 USD ($) Contract | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2019 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 17 | 6 | 33 | 26
Total Pre-Modification Outstanding Recorded Investment | $ 1,309 | $ 217 | $ 1,781 | $ 7,381
Post- Modification Outstanding Recorded Investment | 1,165 | 215 | 1,607 | 6,917
Troubled Debt Restructuring [Policy Text Block] | $ 489 | $ 0 | $ 489 | $ 398
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 1 | 1 | 2
Total Pre-Modification Outstanding Recorded Investment | $ 629 | $ 95 | $ 629 | $ 156
Post- Modification Outstanding Recorded Investment | 625 | 96 | 625 | 157
Troubled Debt Restructuring [Policy Text Block] | $ 489 | $ 0 | $ 489 | $ 0
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 12 | 3 | 16 | 14
Total Pre-Modification Outstanding Recorded Investment | $ 613 | $ 85 | $ 877 | $ 1,008
Post- Modification Outstanding Recorded Investment | 477 | 85 | 729 | 933
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 0 | $ 0 | $ 1
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  |  | 2 | 3
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 12 | $ 6,119
Post- Modification Outstanding Recorded Investment |  |  | 8 | 5,740
Troubled Debt Restructuring [Policy Text Block] |  |  | $ 0 | $ 397
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 4 | 2 | 14 | 7
Total Pre-Modification Outstanding Recorded Investment | $ 67 | $ 37 | $ 263 | $ 98
Post- Modification Outstanding Recorded Investment | 63 | 34 | 245 | 87
Troubled Debt Restructuring [Policy Text Block] | 0 | 0 | 0 | 0
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 17
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 17
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 | 0
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 705 | 32 | 776 | 149
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 629 | 0 | 629 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 33 | 32 | 33 | 149
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 43 | 0 | 114 | 0
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 604 | 185 | 1,005 | 7,215
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 95 | 0 | 156
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 580 | 53 | 844 | 842
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 12 | 6,119
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 24 | $ 37 | $ 149 | $ 98

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